REXX/VM Programming

Outline

1. Contents
2. Description
3. Audience
4. Prerequisites
5. Topics Include
6. Duration
7. Minimum Requirements
8. Media

Description

Teaches how to write and execute REXX EXECs and gain a working knowledge of the REXX language implemented in a VM/CMS environment.

Audience

Application developers and some end users.

Prerequisites

Experience in a VM operating system.

Topics Include

Introduction to REXX

• Features and benefits of REXX
• Systems Application Architecture
• Components of the REXX language

REXX Expressions

• Variables
• Operators: Arithmetic, Comparison, Logical, Concatenation
• Order of Operation
• Expressions

Terminal I/O and Control

• Structures
• SAY, PULL and PARSE Instructions
• Branching Structures: IF-THEN-ELSE, SELECT-THEN-OTHERWISE-END
• Looping Structures: DO-END, DO-WHILE-END, DO-FOREVER-END, DO-UNTIL-END
• Interrupt Statements: EXIT, LEAVE

Functions and Subroutines

• Functions vs Subroutines
• External vs Internal
• Built-In Functions
• Passing Data

Data Manipulation

• Compound Variables and Stems
• Program Stack Instructions: PUSH, PULL
• Program Stack Functions: MAKEBUF, DROPBUF

Host Environment Commands

• Issuing Host Commands
• REXX Host Environments
• EXECIO and ADDRESS Commands

Executing an EXEC

• Explicit Execution
• Implicit Execution
• Execution from Various Environments

Debugging an Exec

• The TRACE Instruction
• The SET EXECTRAC Command
• CMS Immediate Commands
• Special Variables RC and SIGL

Duration

8 hrs

Minimum Requirements

CGA Color Monitor; 512K RAM; 1.7MB Hard Disk Space; DOS 3.3 or Higher

Media

Diskette
CDROM

© Copyright Serebra Learning Corp., 2002